Glass-pressing apparatus.



No. 628,157.' Patented luly 4, |899.

v G. E. CLEVELAND. GLASS Pnssslns APPARATUS.

(Applxcation Bled Oct 14 1898 2 Sheets-Sheet l,

(No Model.)

mekumag? ma mvEN'roR,

Nu. 628,l57. Patented July'4, 1899.

G. E.,CLEV.ELAND.

GLASS PBESSIIG APPARATUS.

(Application, med oct. 14, 1898s,'

l2 Sheets-Sheet 2.

(No hiodel.)

INVENTOR,

ESSES: l '06 @MM 'me N cnms Pneus co. moro-urna.. WASHINGTON. u. c.

UNITED STATES PATENT 4Orricn.

GEORGE E. CLEVELAND, OF FREEDOM, PENNSYLVANIA, ASSIGNOR, BY MESNEASSIGNMENTS, OF ONE-HALF TO MATILDA OVER, OF MUNCIE,

INDIANA.

GLASS-PRESSING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 628,157, dated July 4,1899.

Application filed October 14, 1893,

To all whom, it may concern:

Beit known that I, GEORGE E. CLEVELAND, a citizen of the United States,residing at Freedom, in the county of Beaver and State of Pennsylvania,vhave invented or discovered certain new and useful Improvements inGlass-Pressin g Apparatus, of which improvements the following is aspecification.

The invention described herein relates to certain improvements inglass-presses, said improvements being applicable to the ordinarysingle-plunger presses and also to multiple-plunger presses in which aseries of plun` gers are so mounted as to be capable of being shifted insuccession to position for actuation by the4 operating mechanism.

The invention has for its object a construction of plunger-actuatingmechanism whereby the plunger may be positively actuated for effectingvthe initial shaping operation, but will be actuated and held during thefinal shaping and setting of .the glass through the medium of a springor other vyielding mechanism.

The invention is hereinafter more fully described and claimed. r

In the accompanying drawings, forming a part of this specification,Figure 1 is a side elevation of my improved plunger-.operatingmechanism. Fig. 2 is a View, partly in front elevation and partly insection, showing the plunger and its actuating mechanism when the formeris raised. Fig. 3 is a similar view showing the position of the parts atthe end of the positive movement of the plunger. Fig.

t 3a is a detail view of a portion of the actuating mechanism in' theposition shown in Fig.' 3. Figs. 4 and 5 are views similar to Figs. 1and 2, illustrating a modification in the plunger-actuating'mechanism.In Fig. 5 is shown also means for preventing breakage of the apv paratuswhen too great a quantity of molten metal has been placed in the mold.

For convenience of illustration and description my improvements areshown and described as applied to asingle press; but its adaptationtoother forms of presses will be obvious to those skilled in the art.

As shown in Figs. 1, 2, and 3, the power- 5o shaft l' is mounted insuitable bearings se- Serial No. 693,474. (No model.)

cured to the frame of the press. Arms or disks 2, preferably providedwith radial slots, are secured on the projecting ends of the shaft, andpins 3 are adjustably secured in said slots. These pins are connected byrods 4 to the ends of the cross-head of, which is guided in its verticalmovements by the posts or standards G, secured to the bed of the press.Arms 7 have their inner ends secured on thev pins 3 outside ofthe rods4, and pins S are attached to the outer ends of these arms preferably insuch manner as to permit of the adjustment of the pins 8 along the slots9 in the arc of a circle toward and from the pins 3, as clearly shown inFigs. 1 and 3M The pins Bare connected by rods 10 to the ends of thecross-head 11, movably mounted on the posts or standards 6 above thecross-head 5. The crossheads 5 and l1 are provided at pointsapproximately midway between the posts or standards Withwerticalopenings, through which the plunger-actuating rod 12 passes loosely. Inorder that the plunger-actuating rod may lbe forced down by thecross-heads, collars 13 and 14 are secured to the rod below thecrossheads. The collar 13 is so located on the rod 12 that thecross-head 5 will bear directly thereon during itsdownward movement, soas to positively shift the plunger; but a spring 15 is interposedbetween the collar 1.4 and the cross-head 11, so that the plunger-rodwill be yieldingl y actuated by said cross-head. The rod 12 is raised bythe cross-head 11 through the medium of a spring 16, interposed betweensaidcross-head and a collar 17 on the rod, or by other suitable means.

Vhile it is preferred to so adjust the arms 7 on the pins 3 that the.pins 8 will move along arcs of circles of greater radius than thecircle described by the pins 3, the pins 3 and 8 may be adj usted anequal distance from the axis of the shaft; but in the latter case thecollar 14 should be adj usted on the rod 12,

so as to hold the spring 15 yconstantly under vshaft 1 inthe directionof the arrow a the IOO cross-heads are drawn down. It will be observed,however, that as the arms 7 project backwardly as regards their directrotation from the pins 3 the cross-head 5 will begin its downwardmovement in advance of the cross-head ll,although the pins 3 and 8 maymove in circles of the same radius and having a common center. Theactuating mechanism is so constructed that the plunger will not be givenits full movement b y the crosshead 5, but will be given sufiicientmovement to approximately finish the article. This is clearly shown inFig. 3, which shows the plunger in the lowest position to which it ispositively moved by the cross-head 5.

By reference to Figs. 3 and 3, it will be seen that when the pins 3 andthe cross-head 5 have reached the lower limit'of their movements thepins 8 and cross-head ll will be above the lower limits of theirmovements. By the continued rotation of the shaft l the pins 8 andcross-head ll will be moved down, so com pressing the spring l5 that itwill exert sufficient pressure of the plunger to force it down under ayielding pressure to complete the shaping of the article. Thisspring-pressure will be exerted on the plunger for some time after thepins 8 have passed'the power limits of their movements, so that theplunger will be held down a sufficient time to permit the glass to set.

As it is practically impossible to charge the necessary amount of glassin a mold, it has heretofore been deemed impracticable to employ apositively-actuated plunger, as if atoo large amount of glass wereplaced in the mold and the plunger moved ,its full stroke positively aportion of the glass would be squeezed out of the mold or the actuatingmechanism or mold would be broken.

It is characteristic of the operation of my invention that the mostdificult part of the operation of molding glass-z'. e., starting theglass to Iiow or spread out along the walls of the mold-is efected bypositive pressure, while the comparatively easy portion of theoperationi. e., continuing the iiow of glass to final shape and holdingit in such a position until the glass becomes set-is eected by yieldingpressure. This initial positive pressure and successive spring-pressurecan be effected by many different forms of mechanism, and hence theinvention as set forth in the terms of the claims are in no wise limitedto any specific construction of mechanism for operating the plunger.

In Figs. 4 and 5 l have shown another form of mechanism adapted toeffect the operation of the plunger. This mechanism consists of disks20, loosely mounted on studs 2l, secured to the posts 6 and provided onopposite sides with eccentric grooves for the receptionofantifriction-rollers22. These antifrictionrollers are secured to oneend of the connectin g-rods 4 and l0, which have their opposite endsconnected to the ends of the cross-heads 5 and l1. The grooves in thefaces of the disks are so formed as to effect the movements ofthecross-heads and plunger-actuating rod, as hereinbefore described. Thedisks are rotated by pinions 23 on the driving-shaft 24, engaging teethon the peripheries of the disks.

In Fig. 5 I have shown further a device for obviating possible damage tomy machine when carelessly operated. WVhile it will be found that themethod of operating the plunger by iirst a positive and then a yieldingforce, as above described, is amply sufficient to guard against breakageof the actuating mechanism or mold -under ordinary usage, it willsometimes happen through the employment of unskilled or careless workmenthat a quantity of molten metal considerably in excess of that requiredto produce the finished article will be placed in the mold. In such acase the molten metal may fill the entire space between the mold andplunger before the plunger has reached the limit of its positive stroke,there being no further space into which the molten metal can flow. Anyfurther positive movement of the plunger into the mold will tend tobreak the mold or other parts of the machine. To guard against suchaccidents, I interpose, as illustrated in Fig. 5 of the drawings, aspring 25 between the-cross-arm 5 and collar 13 of sufflcient stiffnessto withstand compression under ordinary operations; but under theconditions detailed above it will allow of sulficient compression toprevent further movement of the plunger into the mold'while continuingto exert a yielding pressure upon the molten metal Within the moldduring the balance of the operation, and thereby avoid breakage of anypart of the machine.

I claim herein as my invention l. In a glass-pressing apparatus, thecombination of a plunger, plunger-actuating mechanism and connectionsbetween the actuating mechanism andthe plunger, for driving the plungerpositively during a portion of its stroke and applying a yielding forceto the plunger to effect its final movement, substantially as set forth.

2. In a glass-pressing apparatus, the combination of a plunger, meansfor positively driving the plunger for a portion of its stroke and meansfor applying a yielding force to the plunger for effecting the finalmovement thereof, substantially as set forth.

3. In a glass-pressing apparatus, the combination ofa plunger,aplunger-actuating rod, two crossheads adapted to effect the operativemovement of said rod, one of said crossheads operating positively on therod to el'ect its preliminary movement, a yielding connection betweenthe rod and the other cross-head and means for shifting the cross-heads,substantially as set forth.'

4. In a glass-pressing apparatus, the-combination of two cross-heads,means for shifting the cross-heads, a plunger, a plunger-actuating rodpassing loosely through the cross- IIO heads, two shoulders or collarson said rod, one of which is so arranged that one of the cross-headswill have a positive bearing thereon, and a spring arranged between theother collar or shoulder and crosshead, substantially as set forth. n p

5. In a glass-pressing apparatus, the combination of a plunger,aplunger-actuating rod,

v two cross-heads, connections between the rod and cross-heads, wherebyone of the latter will apply a positive force to the rodl and the othercross-head will apply a yielding force to the rod, and means for causingthe crossheads to operate successively, substantially as set forth. l

6. In a glass-pressing apparatus, the combination of a plunger, plungeractuating mechanism, connections between the actuating mechanism and theplunger for imparting to the plunger a positive unyielding initialmovement and a secondary yielding movement, and means for permitting ofthe arrest of the plunger during this initial movement, upon meeting asubstantially unyielding resistance, and the continuance of a yieldingpressure upon the glass within the mold during the remainder of theoperation, substantially as set forth. p

7. In a glass-pressing apparatus, the combination of a p1unger,aplunger-actuating rod, two cross-heads adapted to successively effectthe operative movement of said rod, a con-- nection between one of saidcross-heads and the rod which is under normal operative conditionsunyielding but which is adapted to yield in case the plunger meets witha substantially unyielding resistance to its movement, whereby apositive initial movement is imparted to the plunger under normaloperative conditions, but whereby the plunger may be stopped in itsinitial movement upon meeting a substantially un yielding resistance toits initial movement; a connection between the other of said cross-headsand the rod which is normally yielding, whereby a final yielding forceis applied to the plunger; and means for causing the cross-heads tooperate snccessively, substantially as set forth.

8. In a glass-pressing apparatus, the com'- bination of two cross-heads,means for shifting the cross-heads, a plunger, a plunger-actuatingrod'passing freely through the crossheads, two shoulders or collars onsaid rod, and springs arranged between the said crossheads and saidshoulders or collars, substantially as set forth.

In testimony whereof I have hereunto set my hand.

GEORGE E. CLEVELAND.

IVitnesses DARWIN S. WoLco'rT, M. S. MURPHY.

